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stack switch configuration sync
Hello
we have a stack of 3 switches.
**Question**: When configuration a configuration change is done, do the settings automatically go to the Standby switches?
I ask because one time we changes a setting - dhcp helper address - and when another switch took over as master, that setting was not on the switch. Now that could have been due to operator error - like not saving the configuration.
Hi Rob
I believe you have a stack of Fully Managed switches, M4300 series.
Yes, configuration is shared across the stack. When there is a configuration change, the settings in running configuration are synchronized across all switches in the stack (stack master = management unit; backup master = standby management unit; stack members = slaves). The same, but independently, the startup configuration file is also shared across all switches in the stack.
But, in a Fully Managed switch, any configuration change must saved in order to see the "running configuration" (show run) saved as "startup configuration" file that will survive the reboot.
I am afraid the configuration wasn't saved in your instance below. I hope this helps.
Regards,
2 Replies
Hi Rob
I believe you have a stack of Fully Managed switches, M4300 series.
Yes, configuration is shared across the stack. When there is a configuration change, the settings in running configuration are synchronized across all switches in the stack (stack master = management unit; backup master = standby management unit; stack members = slaves). The same, but independently, the startup configuration file is also shared across all switches in the stack.
But, in a Fully Managed switch, any configuration change must saved in order to see the "running configuration" (show run) saved as "startup configuration" file that will survive the reboot.
I am afraid the configuration wasn't saved in your instance below. I hope this helps.
Regards,
thank you for the answer. I must have not done the save.
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